Half of friends are dropped every seven years, making room for new ones, the research suggests. (Shutter stock)

(Newser)
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It might not be so on Facebook, but the size of people’s actual social networks stays about the same throughout life, LiveScience reports. Most people replace half their friends every 7 years, a survey of 1,000 people finds. The study—which also notes that people often make new friends through familiar means—contradicts previous research that said social networks are shrinking.